* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --secondary-dark: #27ae60;
    --text-color: #333;
    --light-bg: #f5f5f5;
    --white: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--light-bg);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding: 2rem 0;
}

h2 {
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: clamp(1.1rem, 3.5vw, 1.3rem);
    position: relative;
    display: inline-block;
}

h2:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
}

.input-section {
    margin-bottom: 2rem;
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 6px 15px var(--shadow-color);
    transform: translateY(0);
    transition: var(--transition);
}

.story-container {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    background-color: var(--white);
    font-size: clamp(1rem, 3.5vw, 1.2rem);
    line-height: 1.8;
    margin-bottom: 1rem;
    outline: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    box-shadow: inset 0 2px 5px var(--shadow-color);
    transition: var(--transition);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: flex-start;
    align-content: flex-start;
    overflow: visible;
}

.story-container:focus {
    border-color: var(--primary-color);
    box-shadow: inset 0 2px 5px var(--shadow-color), 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.story-container:empty:before {
    content: attr(placeholder);
    color: #999;
    font-style: italic;
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.app-button {
    display: block;
    width: 100%;
    padding: 0.75rem;
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: clamp(0.9rem, 3vw, 1rem);
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px var(--shadow-color);
    transform: translateY(0);
}

.primary-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.secondary-button {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
}

button:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: var(--transition);
}

button:active {
    transform: translateY(1px);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn-word {
    font-size: 1em;
    padding: 0.4rem 0.8rem;
    margin: 0.2rem;
    border: 1px solid #ccc;
    white-space: nowrap;
    text-transform: uppercase;
    display: inline-block;
    background-color: #f8f9fa;
    color: var(--text-color);
    border-radius: var(--border-radius);
    box-shadow: 0 1px 2px var(--shadow-color);
    cursor: pointer;
    min-height: 2.5rem;
    line-height: 1.2;
    vertical-align: middle;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

@media (max-width: 480px) {
    main {
        padding: 1.5rem 0;
    }

    .input-section {
        padding: 1rem;
    }

    .story-container {
        min-height: 130px;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .btn-word {
        padding: 0.5rem;
    }
}

@media (hover: none) {
    .btn-word {
        -webkit-tap-highlight-color: transparent;
        user-select: none;
    }
}